Lab Rats (2012)
S03E08 Principal from Another Planet
Episode Overview
During a lunar eclipse, Principal Perry shows up at the house to announce that aliens have landed, leaving Bree, Chase, and Donald unsettled, while Adam and Leo are taken aback. She claims that Chase's stomach troubles are due to an alien growing inside him and starts chasing him. As chaos ensues, they notice green goo oozing from Principal Perry's ears and mouth. Donald then reveals she's an alien. The principal pursues everyone while Leo films the commotion, eventually exhausting herself. When Leo accidentally wakes her, she takes off with him to the school. Adam uses his heat vision to destroy the alien pods left by Principal Perry, freeing Leo. Just as Donald arrives, the mothership beams Principal Perry away, but to their surprise, she returns without her alien traits. It turns out this was all part of Leo's entry for a contest.
